Multiple-needle detector for looms



June 28 K. J. UNwlN [VIUIJ'I'IPI]y NEEDLE DETECTOR FOR LOOMS Filed Jan. 5, 1926 50 I9 Patented June 28, 1927.

ii mien sin KENNETH 1T. UNWIN, .OFf SHE/EWSBUBY, `Ivi.AeESACHxLlSE''JS, ASSIGNOB JTO y013.0NIP-,TON "&1

1,633,650 fPATfEN fof-Frrcan,

."KNOWLES LOOM WORKS, 0F WORCESTER,MASSACI-IUSETTS, A'CORPORATION `OIE? fMASSACI'ISETTS.

'Application 'filed January the `weights will 'be moving forwardly and the yarn is spared the strain of setting the weights in mot-ion. "Vhen-a detector as set forth in'said application is employed .on high speed 'looms *there 'is likelihood that `the weights will'begiven toolgreat'a movement at the startand will not act as desired and it is a 'further object of my inv'entionto provide means for `permitting the use ofthis style of 'detector on'high speed looms by imparting a gradually. accelerating movement to the weightsfto the end that the latter will not rebound improperly.

` With these and other objects in view.

which will appear-as the description proceeds, my invention resides inthe .combination and arrangement of parts 'hereinafter ydescribed and Yset forth in the claim.Y

In the 'accompanying drawings wherein I "have shownv a convenient vembodiment of my invention, i

Fig. l is a side elevation-dfn detector, certain parts being in section, showing the detector in normal position with the'deviceA for overcoming the yinertia of. lthe weights about to begin its operation,

Fig.. 2 is a top :plan view of the structure shown in Fig. l, 'Y

Fig. 8 is a front elevation of the yoke for withdrawing the detectors at thel time of transfer, taken in the direction of arrow 3, Fig. 1,

Fig. 4: is a fragmentary front elevation of the detector taken in the direction of arrow 4, Fig. 1,7and i Fig. 5 is a fragmentary view showing the relation of the lay-carried cam and' the weight-actuating lever as they are related at the end of the detecting stroke.

By referring to the drawings it will..be

between 'which eX/tends v'a shaft 31.

AMULTinta-NEEDLE1nnrrncirortron.',Looivis.

5 7, 1926. Serial No. 79,438. y

seenfthat lIfhavevp'roi'fided'a strand 10 to which is adjustably held a support. 11 -meansfof bolt 12.* The upper Vforward'end 'ofsaid supportll'isiprovided with a rib 13 'whichentersa notch Iletforlned on the lower entlofa detector carrier 15. Said carrier yhas slid'ably mounted therein applurality of detectorsl' eachof-'whichhas a lower rearwardlyextending yarn engaging end'17 and anupperindicating portion 18'to cooperate ,with 'an actuating? lever l19. Y

A bracket v20 is secured to said carrier .andi'h'as a'forwardlyy extending arm'to which is secured one end: of a tension Aspring .21 Vthe other endof which extends through the Vlower end of thecarrier landthe upper end ofthc support j11fand is held in positionnby means Lof a'pin 22 which engages the rearface of'the support 11. .lVhen sufviicient yarn ispresent onlthe bobbin 'B lo `f cated in the shuttle S, andthe'lay'L is mov- Aingforwardly on the detecting beat, all of lthe detectors '16 will be movedforwardly so that downward'motion of the actuator' llever '1'9 will `be 'unresis'tetl NVhen the amount of yarn present is so small, however, thatione ofthe holes 23 in thebobbin is uncovered the corresponding detector end 17 will pass into the opening as the lay advances and will remain unmoved. The cor- .respondinge'nd 18 will therefore remain in the path yofithe actuator lever 19 and will resist 'downward motion ofthe latter-to effeet indication of weft exhaustion, which is .indicated to the replenishing mechanism (not shown) ofthe loom. The matter thus vfar described is of commonconstruction and 'forms.. no `part .of my present f invention.

, In carrying out Vmy invention I provide :the stand v15 withifaypair of spaced Years y30 l Said ears '30 are so locatedthat the axis of the shaft 31 is vertically over the upright portions of the detectors 16. Pivotally mounted on the shaft 31 between the ears 80 is a plurality of weights 32 which are lighter' than those heretofore employed because of the fact that no portion of the weight extends behind the axis of shaft 31. I am enabled to place the shaft 31 as described by constructing the detector withdrawing device 33 as shown in Fig. 3, where it will be seen thatsaid device comprises Aa pair of depending arms 34 and 35, respectively,

which are connected together by an arch 36 vextending over the shaft 31 and the bearing as shown in Figs. 1 and 4. Said lever hasy an upwardly extending arm 42 which lies behind the extended end of a pin 43 passing between the arms 34 and 35, respectively. Said lever is further provided with a rearwardly extending arm 44 on which is rotatably mounted a roll 45 and held by gravity against a stop 46 to be in proper vertical alignment. The pin 43 extends behind the upright portions of the detectors 16 and when moved forwardly operates to withdraw the detectors and also to move the weights 32. The forward face of the lay is provided with a bracket 47 on which is adjustably secured a cam plate 48 having a cam face 49 the contour of which is set forth in Figs. 1 and 5.

In operation the cam plate 48 will be so located that as it advances the lower portion 50 thereof will engage the bottom of roll 45 and set the lever 40 in motion gradually, the effect of which is to move the pin 43 forwardly to overcome the inertia of the weigl'its 32 and also to move the detectors 16 forwardly. The face of the cam is so designed that the weights and detectors will gradually acquire a rate of speed slightly less than that of the advancing bobbin and the latter will overtake the detector in sufficient time to enable the detector to function in the usual manner. As the lay continues its forward movement the roll 45 will engage and ride along the dwell face 51 of the cam plate. Obviously, as soon as the roll reaches the dwell face-51 further forward movement of the weights and detectors by the cam will cease and the said weights and detectors will then be under control of the surface to be detected. The cam and roll are so related that the latter will reach the dwell 51 at such a time that the remainder of the forward movement of the lay will movethe indicating end 18 from under the actuator lever 19 when enough yarn remains on the bobbin for continued weaving. rI`he indicating ends 18 of the detectors are made somewhat longer than is usual so that when control of the weights passes from the cam to the bobbin there will be a sufficient length of the indicating end 18 under the actuator lever 19 to trip the latter at indication. In this way the weights are. set in motion before the detectors are engaged by the yarn and the latter is spared the strain of overcoming the inertia of the weights and this result is accomplished by setting the weights in motion gradually so that they will lnot rebound and operate improperly.

From the foregoing it will be seen that I have provided a weft detector of the multiple needle type wherein the detectors and their weights gradually acquire a. speed slightly less than that of the advancing bobbin by means independent of the detector and the detectors are then permitted to engage the bobbin to function as usual.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the Spirit and scope of the invention, and I do not wish to be limited to the details herein disclosed, but what I claim is:

In a weft detector for looms, a plurality of detectors to engage the surface to be detected, a carrier on which said detectors are mounted, a plurality of weights one for each detector, a lay, a lever rpivotally mounted with respect to the carrier, a cam carried by the lay to engage a portion of the lever to set the latter in motion gradually, and connections between the lever and the weights to impart the gradually increasing motion of the lever to the weights to' the end that the inertia. of the weights may be overcome gradually.

In testimony whereof I have hereuntov affixed my signature.

KENNETH J. UNIIN. 

